Selecting clearer for clearing spun yarns



Jan. 25, 1955 E. DOLL SELECTING CLEARER FOR CLEARING SPUN YARNS Filed Dec. 12, 1950 United States Patent SELECTING. CLEARER. FOR CLEARING SPUN. YARNS Edouard'Doll, Paris; France Application December12, 1950,- Serial No. 200,359

Claims priority,- application. France. December 19,. 1949.

4 Claims. (CI. 28-64) One object of the presentinvention is a device. for checking. and clearing spun. yarns, in order to. eliminate defects appearingon said yarns, and spoiling. their appearanceand mechanical properties, and; avoidingat the same time unnecessary stoppage. of; the machine.

Devices commonly used. for clearing. yarns. comprise aslot withfixed or. movable edges throughwhich passes the yarn to be checked, said slot being located in a plane at right. angle or at any angle-t the path of the yarn. The breadth of the said slot. is so. adjusted that defects exceeding a given-diameter, but whatevertheirlengthmay he, cannot get through, the yarn being thus stoppedand possibly broken if pulledfurther; In the caseof a movable: edge; slot,.the friction-of the" lump releases, by some mechanical means, the closing: of asecond member. causing the yarn to be stopped by a strongsqueezing, such atresult increasing the. sensitiveness of. the apparatus.

The checking. principles and operating. methods of both devices are technically identical: both stop all. defects having a suihcient diameter greatv enough'to squeeze into the slot or to cause operation of. the relay,.whatever be the length of the defect.

Furthermore complex' devices are provided: with successive members in order that a defect being missed by one of the said members shouldsbe stopped by thefollowingone, whatever be the length of the said defect.

However, if short knots, even: of a certain diameter, are not objectionable for thesubsequent use of. the yarn, in iSiIlOtI the same for defects of the same, or lesser diameter, only slightly exceeding-the diameteroftheryarn, but having a certain length, or for defects of ala-rgerrdb ameter, even if, in this case; they have:only a; slight length.

In fact, the criterion is that the=apparentzsurfaceiofi the defect (the product of itslen'gth by its diameter)" should not exceeda maximum value dependingupon the quality required. for. subsequent use of the: yarn;

Experience shows thatelongateddefects, whicliare the finest'ones, frequently are the thinner-andh-ave a tendency to beflattenedout and to getithrough the checking slots Without the yarn, being broken. Consequently; the. slot must' be very tight and accurately adjusted; However, in this latter case, the yarn beingconstantly pulled through a-tightslot, breaks at the slightest or even barelynotreeable defect, and, above -all,'.the yarn becomesrscratclred along its whole length, whichrspoils greatly-its appearance and; mechanical properties, and'moreover causesa rapid checking of the yarn clearer, preventingitv from operating correctly.

Moreover the accuracy of the adjustment required from any eflicient apparatus, whatever the extentto which'ithas been improved, requires for all. existing apparatus, the provision of records. resulting from-.ma'ny tGStS-Wllhrdifferent' yarn diameters, and the. use: of. gauges" for; adjust.- ing-each apparatus. In such.cases the adjustment ofian apparatus, when starting up a batch of'yarn, isa' lengthy operation which must be repeated on a large number of apparatus simultaneously used.

All the above-mentioned disadvantages are'done'away with in using the device according to the invention, viz.:

Unnecessary stoppings by triflingdefects,

Impossibility of using modern Winders with great'linear speeds because of the inertia of the selecting movable members,

Flattening out of elongated'defects, Scratching oftthe. yarn,

"ice

Operational,difiiculties.v in. adjusting each. apparatus and in determining the best suitable one,

Impossibility-of checking theadjustment. of an apparatus for any reason ;in;one glance,

Cloggingof yarn clearers, whence irregular: operation of the said clearers.

Each of. thesedisadvantages, separately taken,. being enough to make an apparatus ineflicient. or practically unusable. for. careful clearing ;in conditions1which are .not purelyexperimentaL-Jhat is.on a. production basis;

The; principle of. the device .accordingto the-invention is to.use. a stopping member having avery high. sensitivity and. strongsqueezingmffect, while only passing. theyarn through the slot of. said'rnemberincase-adefectappears on. the. yarn, the normal path of the yarn. justpassing along the said-stopping member,,andtohave said member preceded by a. selecting'member, feeling. the. yarn and shifting it;laterally if a defectaappears, the degreeof said shifting beingafunction of the diameter of. the defect, and the durationof said: shifting being a function of thelength of the defect-,which-makes .it: possible to eliminate the defects accordingto the criterion of. maximum apparent surface hereabovementioned.

An embodiment of-ithe. device accordingto the invention is described in detailhereafter with .reference to the annexed illustrative drawings, in which:

Fig, 1. isa diagrammatichorizontal projection of; a simple embodiment, not comprising the adjustment of: the slot breadth;

Fig, 2 is a cross section along line Il*ll' ofFig. 1;

Fig. 3-is-- an elevational. view of. a device comprising an adjustment-of'theslot breadth;

Fig. 4 is a plan view;.

Fig, 5 isacross-section;along. line V-V ofFig. 3-.

The apparatus diagrammatically shown in Figs; 1 and 2 comprises a base. plate-.1, two=pig.-.tail thread guides 2, between which -theyarn 3 moves from A to B; Between these thread guides the base plate 1' carries'a: blade-.4 oblique with reference-to the yarn path and having, in the horizontal plane of said.-path,,a slot SI The breadth of. the slot 5- increases'frompoint 5a, Where it. slightly exceedsthe value of the-yarn diameter, to point"5b,.where its-breadth however slightlyexceeds its value at point .5a. A blade 6, carried by the base-plated at'ri'ghtan-gleto directionA B, is.=-provided,- in the. horizontal plate. of the. yarn,- with a: slot 7 the breadth: of which slightly exceeds the diameter of yarn 3. The said blade is located near the. end-4bof oblique blade- 4; and: terminating at point 6b shortof-ax-is-A, B. A stop-8 limits displacement- 0f the-yarn to the side remotetrom'plate 6. v

Any defect appearing at oblique blade:4 .causes,:a=re;- sistance. which is translated into i a force; R, which: may be: divided into. a component, R1; at: right angle; to the plane: of the blade, and a component R2 directed along I direetion 5a, 5b." Under-the; effect of? component R2,

theryarngis shifted.- towards: 517,,forming an" angle-to the normal path of the yarn; The normaltensionof the yarn in the apparatus, opposing itself .tor such lateral shifting, creates an efiortaR; directed? along the-bisector; of the..angle: formedaby; the yarn and practically-at. right angle to aX lS*A,,B. Force P- may alsoibe dividedtinto a component: P1- at right angle to; theplane of the: plate and Of:"th6 same-direction as component-R1, to which'it is. added, and a component P2 directed along "direction 5b; 5a,, tending to progressively balance component R2 of opposite direction: P1 and, P2: rapidly increase with the displacement of theyarn. The: larger-increasing defects are. shiftedunder tlie-effect ofithe difference: of forces Rz-Pz--inoblique slot" 5; to" points nearer and nearer to 5biand they: are urged" to pass through the said; slot mider'theeif'ectof-the sum offorces Ri-l-Pi. Here, either of: the following conditions may happen:

(1) The defect has such a diameter that it passes through oblique blade 4 at apoint located between: 5a and 5b. At this instant, the yarn having been laterally shifted is engaged in slot.v 7' of the blade. 6.. Two possibilities may then appear: a

(a) The defect'has a length smaller than the distance from X1 to are Y,,Z, measured on a line passing through Xi and the exitipigftaill In.thiscase,afterhavingpassed through oblique slot 5, the yarn will be released and immediately returned to its normal position, before resurning its forward movement; the defect passes outside blade 6 and through the apparatus.

(b) The length of the defect exceeds the distance from its crossing point X1 through slot 5 of oblique blade 4, to circular arc Y, Z. Then the defect is squeezed in the slot of the stopping member and the yarn breaks.

'(2) The defect has such a diameter that it cannot get through oblique slot 5 and reaches point 5b: it is then squeezed into slot 7 of stopping member 6, and the yarn breaks.

Stop 8 limits the displacement of the yarn at its return which is quite rapid, to prevent it from swinging out of the other side of the apparatus, due to its inertia.

Experience shows that, to obtain a good result, the breadth of slot 7 of blade 6 must be slightly smaller than that of oblique slot 5 at point 5a.

The device shown in Figs. 3, 4 and 5 comprises a plate 9, the plane of which comprises the axis or path of the yarn, as determined by thread guides 2. 1 The said plate carries at its base an extension 10, slidably arranged in a cylinder 11 fixed onto a base plate 12. A screw 13 is screwed into extension and a spring 14 tends to bring plate 9 apart from plate 12. Screw 13 makes it possible to adjust the elevation of plate 9 with reference to plate 12 and consequently. as will be understood hereafter, the breadths of the slots in the selecting plate and in the stopping plate. Head 13a of screw 13 is semi-spherical and a square hole 13b is provided within the said head. This arrangement prevents the adjustment from being changed, except by using a special spanner.

An oblique blade 15 is fixed through a part 16 to a support 17 hinged by means of a shaft 18 to base plate 12. On support 17 is fixed a plate 19 of transparent material such as synthetic resin. A blade 20 is secured to a shaft 21 rotatably mounted in support 17 and a very fine spring 22 tends to maintain the said blade 20 in a slightly inclined position with reference to a plane at right angle to the path of the yarn and in the opposite direction to the direction of travel of the said yarn. Blade 15 and blade 20 cooperate with plate 9 to form the slot-shaped openings 5' and 7.

Support 17 acts as a cover for the device and defects wedged between the various parts may be cleared off without difficulty. A return spring 23 holds this support in its normal position.

Stop 8 prevents the yarn from being shifted out of the apparatus, due to reaction, following a lateral shift- The adjustment of the apparatus is performed without using any gauge and without it being necessary to know the yarn data. For such purpose, the following process takes place:

By acting on screw 13 by means of the adjusting spanner the apparatus is opened beyond the opening sought for and, if needed, to the maximum opening.

The yarn is then started and, by means of the adjusting spanner, the apparatus is closed up to the point where it may be perceived that, due to the squeezing at x under blade 15, the yarn in its progression through the device becomes shifted in direction 2.

Screw 13 is then slightly loosened to permit the yarn to move under blade 15 in the vicinity of point x, while maintaining the said yarn sli htly vibrating, due to its friction against blade 15. This vibration, easily perceptible in the course of an inspection, is an evidence of the apparatus not being too wide open. which would impair its efficiency. The permanent shift of the yarn in the z direction reversely indicates too much tightening, which would cause breaks for the slightest defects. the yarn being then, contrarilv to the operating principle of the apparatus, constantly engaged under blade 20.

Once thus regulated, the apparatus operates as stated glaoge with reference to the simple apparatus with fixed a es.

While the invention has been described and shown with reference to a sin le emb diment, it is to be understood that a number of modifications are available to one skilled in the art, within the scope of the following claims and within the spirit of the invention.

What I claim is:

. 1. A device for checking and clearing yarns and eliminating objectionable defects while remaining without action on non-objectionable defects, comprising spaced yarn guides determining the path of movement of a thread of yarn therebetween, a plate arranged be tween said guides in a plane parallel to said path and over which the yarn moves between said guides, a blade arranged obliquely of said path, said blade being arranged over said path and extending substantially to one side thereof and being slightly spaced from said plate to define therewith a slot through which the yarn passes, said slot being slightly wider than the diameter of the yarn, and a stopping member arranged substantially perpendicular to said path wholly to said side thereof, said stopping member having one end arranged adjacent said path and its other end projecting beyond the extremity of said blade at said side of said path, said stopping member defining with said plate a slot through which the yarn passes when deflected to said side of said path by said blade.

2. A device for checking and clearing yarns and eliminating objectionable defects while remaining without action on non-objectionable defects, comprising spaced yarn guides determining the path of movement of a thread of yarn therebetween, a plate arranged between said guides in a plane parallel to said path and over which the yarn moves between said guides, a blade arranged obliquely of said path, said blade being arranged over said path and extending substantially to one side thereof and being slightly spaced from said plate to define therewith a slot through which the yarn passes, said slot being slightly wider than the diameter of the yarn, a stopping member arranged substantially perpendicular to said path wholly to said side thereof, said stopping member having one end arranged adjacent said path and its other end projecting beyond the extremity of said blade at said side of said path, said stopping member defining with said plate a slot through which the yarn passes when deflected to said side of said path by said blade, a common support for said blade and said stopping member, said blade and said stopping member being movable away from said plate, and spring means for biasing said blade and said stopping member toward said plate.

3. A device for checking and clearing yarns and eliminating objectionable defects while remaining without action on non-objectionable defects, comprising spaced yarn guides determining the path of movement of a thread of yarn therebetween, a plate arranged between said guides in a plane parallel to said path and over which the yarn moves between said guides, a blade arranged obliquely of said path, said blade being arranged over said path and extending substantially to one side thereof and being slightly spaced from said plate to define therewith a slot through which the yarn passes, said slot being slightly wider than the diameter of the yarn, a stopping member arranged substantially per.- pendicular to said path wholly to said side thereof, said stopping member having one end arranged adjacent said path and its other end projecting beyond the extremity of said blade at said side of said path, said stopping member defining with said plate a slot through which the yarn passes when deflected to said side of said path by said blade, said stopping member being adjustable toward and away from said plate, means supporting said plate for linear movement toward, and away from said path, means biasing said plate toward said path, and adjustable means for limiting movement of said plate toward said path.

4. A device for checking and clearing yarns and eliminating objectionable defects while remaining with out action on non-objectionable defects, comprising spaced yarn guides determining the path of movement of a thread of yarn therebetween, a plate arranged between said guides in a plane parallel to said path and over which the yarn moves between said guides, a blade arranged obliquely of said path, said blade being arranged over said path and extending substantially to one side thereof and being slightly spaced from said plate to define therewith a slot through which the yarn passes, said slot being slightly wider than the diameter of the yarn, a stopping member arranged substantially perpendicular to said path wholly to said side thereof, said stopping member having one end arranged adjacent said path and its other end projecting beyond the extremity of said blade at said side of said path, said stopping member defining with said plate a slot through 2,700,204 p 6 which the yarn passes when deflected to said side of able means for limiting movement of said plate toward said path by said blade, a common support for said said path. blade and said stopping member, said blade and said stopping memger laeing movzgalgl agvay fom said plate, 5 References Cited in the file of this patent spring means or iasing sai a e an said stopping member toward said plate, means supporting said plate UNITED STATES PATENTS for linear movement toward and away from said path, 2,522,751 D011 Sept. 19, 1950 means biasing said plate toward said path, and adjust- 2,563,814 Brink Aug. 14, 1951 

